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# cpu_features, a cross platform C99 library to get cpu features at runtime.
load("@bazel_skylib//lib:selects.bzl", "selects")
load("@rules_cc//cc:cc_binary.bzl", "cc_binary")
load("@rules_cc//cc:cc_library.bzl", "cc_library")
load("@rules_cc//cc:cc_test.bzl", "cc_test")
package(
default_visibility = ["//visibility:public"],
licenses = ["notice"],
)
exports_files(["LICENSE"])
INCLUDES = ["include"]
C99_FLAGS = select({
"@platforms//os:windows": [],
"//conditions:default": [
"-Wall",
"-Wextra",
"-Wmissing-declarations",
"-Wmissing-prototypes",
"-Wno-implicit-fallthrough",
"-Wno-unused-function",
"-Wold-style-definition",
"-Wshadow",
"-Wsign-compare",
"-Wstrict-prototypes",
],
})
PLATFORM_CPU_X86 = ("@platforms//cpu:x86_32", "@platforms//cpu:x86_64")
PLATFORM_CPU_ARM = ("@platforms//cpu:arm", "@platforms//cpu:armv7")
PLATFORM_CPU_ARM64 = "@platforms//cpu:arm64"
PLATFORM_CPU_MIPS = "@platforms//cpu:mips64"
PLATFORM_CPU_PPC = "@platforms//cpu:ppc"
PLATFORM_CPU_RISCV = ("@platforms//cpu:riscv32", "@platforms//cpu:riscv64")
cc_library(
name = "cpu_features_macros",
copts = C99_FLAGS,
includes = INCLUDES,
textual_hdrs = ["include/cpu_features_macros.h"],
)
cc_library(
name = "cpu_features_cache_info",
copts = C99_FLAGS,
includes = INCLUDES,
textual_hdrs = ["include/cpu_features_cache_info.h"],
deps = [":cpu_features_macros"],
)
cc_library(
name = "bit_utils",
copts = C99_FLAGS,
includes = INCLUDES,
textual_hdrs = ["include/internal/bit_utils.h"],
deps = [":cpu_features_macros"],
)
cc_test(
name = "bit_utils_test",
srcs = ["test/bit_utils_test.cc"],
includes = INCLUDES,
deps = [
":bit_utils",
"@googletest//:gtest_main",
],
)
cc_library(
name = "memory_utils",
copts = C99_FLAGS,
includes = INCLUDES,
textual_hdrs = [
"src/copy.inl",
"src/equals.inl",
],
)
cc_library(
name = "string_view",
srcs = [
"src/string_view.c",
],
copts = C99_FLAGS,
includes = INCLUDES,
textual_hdrs = ["include/internal/string_view.h"],
deps = [
":cpu_features_macros",
":memory_utils",
],
)
cc_test(
name = "string_view_test",
srcs = ["test/string_view_test.cc"],
includes = INCLUDES,
deps = [
":string_view",
"@googletest//:gtest_main",
],
)
cc_library(
name = "filesystem",
srcs = ["src/filesystem.c"],
copts = C99_FLAGS,
includes = INCLUDES,
textual_hdrs = ["include/internal/filesystem.h"],
deps = [":cpu_features_macros"],
)
cc_library(
name = "filesystem_for_testing",
testonly = 1,
srcs = [
"src/filesystem.c",
"test/filesystem_for_testing.cc",
],
hdrs = [
"include/internal/filesystem.h",
"test/filesystem_for_testing.h",
],
defines = ["CPU_FEATURES_MOCK_FILESYSTEM"],
includes = INCLUDES,
deps = [
":cpu_features_macros",
],
)
cc_library(
name = "stack_line_reader",
srcs = ["src/stack_line_reader.c"],
copts = C99_FLAGS,
defines = ["STACK_LINE_READER_BUFFER_SIZE=1024"],
includes = INCLUDES,
textual_hdrs = ["include/internal/stack_line_reader.h"],
deps = [
":cpu_features_macros",
":filesystem",
":string_view",
],
)
cc_test(
name = "stack_line_reader_test",
srcs = [
"include/internal/stack_line_reader.h",
"src/stack_line_reader.c",
"test/stack_line_reader_test.cc",
],
defines = ["STACK_LINE_READER_BUFFER_SIZE=16"],
includes = INCLUDES,
deps = [
":cpu_features_macros",
":filesystem_for_testing",
":string_view",
"@googletest//:gtest_main",
],
)
cc_library(
name = "stack_line_reader_to_use_with_filesystem_for_testing",
testonly = 1,
srcs = ["src/stack_line_reader.c"],
hdrs = ["include/internal/stack_line_reader.h"],
copts = C99_FLAGS,
defines = ["STACK_LINE_READER_BUFFER_SIZE=1024"],
includes = INCLUDES,
deps = [
":cpu_features_macros",
":filesystem_for_testing",
":string_view",
],
)
cc_library(
name = "hwcaps",
srcs = [
"src/hwcaps.c",
"src/hwcaps_freebsd_or_openbsd.c",
"src/hwcaps_linux_or_android.c",
],
copts = C99_FLAGS,
defines = selects.with_or({
"@platforms//os:macos": ["HAVE_DLFCN_H"],
("@platforms//os:freebsd", "@platforms//os:openbsd"): ["HAVE_STRONG_ELF_AUX_INFO"],
("@platforms//os:android", "@platforms//os:linux"): ["HAVE_STRONG_GETAUXVAL"],
"//conditions:default": [],
}),
includes = INCLUDES,
textual_hdrs = ["include/internal/hwcaps.h"],
deps = [
":cpu_features_macros",
":filesystem",
":string_view",
],
)
cc_library(
name = "hwcaps_for_testing",
testonly = 1,
srcs = [
"src/hwcaps.c",
"src/hwcaps_freebsd_or_openbsd.c",
"src/hwcaps_linux_or_android.c",
"test/hwcaps_for_testing.cc",
],
hdrs = [
"include/internal/hwcaps.h",
"test/hwcaps_for_testing.h",
],
defines = [
"CPU_FEATURES_MOCK_GET_ELF_HWCAP_FROM_GETAUXVAL",
"CPU_FEATURES_TEST",
],
includes = INCLUDES,
deps = [
":cpu_features_macros",
":filesystem_for_testing",
":string_view",
],
)
cc_library(
name = "cpuinfo",
srcs = selects.with_or({
PLATFORM_CPU_X86: [
"src/impl_x86_freebsd.c",
"src/impl_x86_linux_or_android.c",
"src/impl_x86_macos.c",
"src/impl_x86_windows.c",
],
PLATFORM_CPU_ARM: ["src/impl_arm_linux_or_android.c"],
PLATFORM_CPU_ARM64: [
"src/impl_aarch64_cpuid.c",
"src/impl_aarch64_linux_or_android.c",
"src/impl_aarch64_macos_or_iphone.c",
"src/impl_aarch64_windows.c",
"src/impl_aarch64_freebsd_or_openbsd.c",
],
PLATFORM_CPU_MIPS: ["src/impl_mips_linux_or_android.c"],
PLATFORM_CPU_PPC: ["src/impl_ppc_linux.c"],
PLATFORM_CPU_RISCV: ["src/impl_riscv_linux.c"],
}),
hdrs = selects.with_or({
PLATFORM_CPU_X86: [
"include/cpuinfo_x86.h",
"include/internal/cpuid_x86.h",
"include/internal/windows_utils.h",
],
PLATFORM_CPU_ARM: ["include/cpuinfo_arm.h"],
PLATFORM_CPU_ARM64: [
"include/cpuinfo_aarch64.h",
"include/internal/cpuid_aarch64.h",
],
PLATFORM_CPU_MIPS: ["include/cpuinfo_mips.h"],
PLATFORM_CPU_PPC: ["include/cpuinfo_ppc.h"],
PLATFORM_CPU_RISCV: ["include/cpuinfo_riscv.h"],
}),
copts = C99_FLAGS,
defines = selects.with_or({
"@platforms//os:macos": ["HAVE_SYSCTLBYNAME"],
"//conditions:default": [],
}),
includes = INCLUDES,
textual_hdrs = selects.with_or({
PLATFORM_CPU_X86: ["src/impl_x86__base_implementation.inl"],
PLATFORM_CPU_ARM64: ["src/impl_aarch64__base_implementation.inl"],
"//conditions:default": [],
}) + [
"src/define_introspection.inl",
"src/define_introspection_and_hwcaps.inl",
],
deps = [
":bit_utils",
":cpu_features_cache_info",
":cpu_features_macros",
":filesystem",
":hwcaps",
":memory_utils",
":stack_line_reader",
":string_view",
],
)
cc_library(
name = "cpuinfo_for_testing",
testonly = 1,
srcs = selects.with_or({
PLATFORM_CPU_X86: [
"src/impl_x86_freebsd.c",
"src/impl_x86_linux_or_android.c",
"src/impl_x86_macos.c",
"src/impl_x86_windows.c",
],
PLATFORM_CPU_ARM: ["src/impl_arm_linux_or_android.c"],
PLATFORM_CPU_ARM64: [
"src/impl_aarch64_cpuid.c",
"src/impl_aarch64_linux_or_android.c",
"src/impl_aarch64_macos_or_iphone.c",
"src/impl_aarch64_windows.c",
"src/impl_aarch64_freebsd_or_openbsd.c",
],
PLATFORM_CPU_MIPS: ["src/impl_mips_linux_or_android.c"],
PLATFORM_CPU_PPC: ["src/impl_ppc_linux.c"],
PLATFORM_CPU_RISCV: ["src/impl_riscv_linux.c"],
}),
hdrs = selects.with_or({
PLATFORM_CPU_X86: [
"include/cpuinfo_x86.h",
"include/internal/cpuid_x86.h",
"include/internal/windows_utils.h",
],
PLATFORM_CPU_ARM: ["include/cpuinfo_arm.h"],
PLATFORM_CPU_ARM64: [
"include/cpuinfo_aarch64.h",
"include/internal/cpuid_aarch64.h",
],
PLATFORM_CPU_MIPS: ["include/cpuinfo_mips.h"],
PLATFORM_CPU_PPC: ["include/cpuinfo_ppc.h"],
PLATFORM_CPU_RISCV: ["include/cpuinfo_riscv.h"],
}),
copts = C99_FLAGS,
defines = selects.with_or({
PLATFORM_CPU_X86: ["CPU_FEATURES_MOCK_CPUID_X86"],
PLATFORM_CPU_ARM64: [
"CPU_FEATURES_MOCK_CPUID_AARCH64",
"CPU_FEATURES_MOCK_SYSCTL_AARCH64",
],
"//conditions:default": [],
}) + selects.with_or({
"@platforms//os:macos": ["HAVE_SYSCTLBYNAME"],
"//conditions:default": [],
}),
includes = INCLUDES,
textual_hdrs = selects.with_or({
PLATFORM_CPU_X86: ["src/impl_x86__base_implementation.inl"],
PLATFORM_CPU_ARM64: ["src/impl_aarch64__base_implementation.inl"],
"//conditions:default": [],
}) + [
"src/define_introspection.inl",
"src/define_introspection_and_hwcaps.inl",
],
deps = [
":bit_utils",
":cpu_features_cache_info",
":cpu_features_macros",
":filesystem_for_testing",
":hwcaps_for_testing",
":memory_utils",
":stack_line_reader_to_use_with_filesystem_for_testing",
":string_view",
],
)
cc_test(
name = "cpuinfo_test",
srcs = selects.with_or({
PLATFORM_CPU_ARM64: ["test/cpuinfo_aarch64_test.cc"],
PLATFORM_CPU_ARM: ["test/cpuinfo_arm_test.cc"],
PLATFORM_CPU_MIPS: ["test/cpuinfo_mips_test.cc"],
PLATFORM_CPU_PPC: ["test/cpuinfo_ppc_test.cc"],
PLATFORM_CPU_RISCV: ["test/cpuinfo_riscv_test.cc"],
PLATFORM_CPU_X86: ["test/cpuinfo_x86_test.cc"],
}),
includes = INCLUDES,
deps = [
":cpuinfo_for_testing",
":filesystem_for_testing",
":hwcaps_for_testing",
":string_view",
"@googletest//:gtest_main",
],
)
cc_binary(
name = "list_cpu_features",
srcs = ["src/utils/list_cpu_features.c"],
copts = C99_FLAGS,
includes = INCLUDES,
deps = [
":bit_utils",
":cpu_features_macros",
":cpuinfo",
],
)
cc_library(
name = "ndk_compat",
srcs = ["ndk_compat/cpu-features.c"],
copts = C99_FLAGS,
includes = INCLUDES + ["ndk_compat"],
target_compatible_with = select({
"@platforms//os:windows": ["@platforms//:incompatible"],
"//conditions:default": [],
}),
textual_hdrs = ["ndk_compat/cpu-features.h"],
deps = [
":cpu_features_macros",
":cpuinfo",
":filesystem",
":stack_line_reader",
":string_view",
],
)